1 /*
2 * File: bf5xx_sport.c
3 * Based on:
4 * Author: Roy Huang <roy.huang@analog.com>
5 *
6 * Created: Tue Sep 21 10:52:42 CEST 2004
7 * Description:
8 * Blackfin SPORT Driver
9 *
10 * Copyright 2004-2007 Analog Devices Inc.
11 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 */
29
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/delay.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/gpio.h>
35 #include <linux/bug.h>
36 #include <asm/portmux.h>
37 #include <asm/dma.h>
38 #include <asm/blackfin.h>
39 #include <asm/cacheflush.h>
40
41 #include "bf5xx-sport.h"
42 /* delay between frame sync pulse and first data bit in multichannel mode */
43 #define FRAME_DELAY (1<<12)
44
45 struct sport_device *sport_handle;
46 EXPORT_SYMBOL(sport_handle);
47 /* note: multichannel is in units of 8 channels,
48 * tdm_count is # channels NOT / 8 ! */
sport_set_multichannel(struct sport_device * sport,int tdm_count,u32 mask,int packed)49 int sport_set_multichannel(struct sport_device *sport,
50 int tdm_count, u32 mask, int packed)
51 {
52 pr_debug("%s tdm_count=%d mask:0x%08x packed=%d\n", __func__,
53 tdm_count, mask, packed);
54
55 if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
56 return -EBUSY;
57
58 if (tdm_count & 0x7)
59 return -EINVAL;
60
61 if (tdm_count > 32)
62 return -EINVAL; /* Only support less than 32 channels now */
63
64 if (tdm_count) {
65 sport->regs->mcmc1 = ((tdm_count>>3)-1) << 12;
66 sport->regs->mcmc2 = FRAME_DELAY | MCMEN | \
67 (packed ? (MCDTXPE|MCDRXPE) : 0);
68
69 sport->regs->mtcs0 = mask;
70 sport->regs->mrcs0 = mask;
71 sport->regs->mtcs1 = 0;
72 sport->regs->mrcs1 = 0;
73 sport->regs->mtcs2 = 0;
74 sport->regs->mrcs2 = 0;
75 sport->regs->mtcs3 = 0;
76 sport->regs->mrcs3 = 0;
77 } else {
78 sport->regs->mcmc1 = 0;
79 sport->regs->mcmc2 = 0;
80
81 sport->regs->mtcs0 = 0;
82 sport->regs->mrcs0 = 0;
83 }
84
85 sport->regs->mtcs1 = 0; sport->regs->mtcs2 = 0; sport->regs->mtcs3 = 0;
86 sport->regs->mrcs1 = 0; sport->regs->mrcs2 = 0; sport->regs->mrcs3 = 0;
87
88 SSYNC();
89
90 return 0;
91 }
92 EXPORT_SYMBOL(sport_set_multichannel);
93
sport_config_rx(struct sport_device * sport,unsigned int rcr1,unsigned int rcr2,unsigned int clkdiv,unsigned int fsdiv)94 int sport_config_rx(struct sport_device *sport, unsigned int rcr1,
95 unsigned int rcr2, unsigned int clkdiv, unsigned int fsdiv)
96 {
97 if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
98 return -EBUSY;
99
100 sport->regs->rcr1 = rcr1;
101 sport->regs->rcr2 = rcr2;
102 sport->regs->rclkdiv = clkdiv;
103 sport->regs->rfsdiv = fsdiv;
104
105 SSYNC();
106
107 return 0;
108 }
109 EXPORT_SYMBOL(sport_config_rx);
110
sport_config_tx(struct sport_device * sport,unsigned int tcr1,unsigned int tcr2,unsigned int clkdiv,unsigned int fsdiv)111 int sport_config_tx(struct sport_device *sport, unsigned int tcr1,
112 unsigned int tcr2, unsigned int clkdiv, unsigned int fsdiv)
113 {
114 if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
115 return -EBUSY;
116
117 sport->regs->tcr1 = tcr1;
118 sport->regs->tcr2 = tcr2;
119 sport->regs->tclkdiv = clkdiv;
120 sport->regs->tfsdiv = fsdiv;
121
122 SSYNC();
123
124 return 0;
125 }
126 EXPORT_SYMBOL(sport_config_tx);
127
setup_desc(struct dmasg * desc,void * buf,int fragcount,size_t fragsize,unsigned int cfg,unsigned int x_count,unsigned int ycount,size_t wdsize)128 static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
129 size_t fragsize, unsigned int cfg,
130 unsigned int x_count, unsigned int ycount, size_t wdsize)
131 {
132
133 int i;
134
135 for (i = 0; i < fragcount; ++i) {
136 desc[i].next_desc_addr = (unsigned long)&(desc[i + 1]);
137 desc[i].start_addr = (unsigned long)buf + i*fragsize;
138 desc[i].cfg = cfg;
139 desc[i].x_count = x_count;
140 desc[i].x_modify = wdsize;
141 desc[i].y_count = ycount;
142 desc[i].y_modify = wdsize;
143 }
144
145 /* make circular */
146 desc[fragcount-1].next_desc_addr = (unsigned long)desc;
147
148 pr_debug("setup desc: desc0=%p, next0=%lx, desc1=%p,"
149 "next1=%lx\nx_count=%x,y_count=%x,addr=0x%lx,cfs=0x%x\n",
150 &(desc[0]), desc[0].next_desc_addr,
151 &(desc[1]), desc[1].next_desc_addr,
152 desc[0].x_count, desc[0].y_count,
153 desc[0].start_addr, desc[0].cfg);
154 }
155
sport_start(struct sport_device * sport)156 static int sport_start(struct sport_device *sport)
157 {
158 enable_dma(sport->dma_rx_chan);
159 enable_dma(sport->dma_tx_chan);
160 sport->regs->rcr1 |= RSPEN;
161 sport->regs->tcr1 |= TSPEN;
162 SSYNC();
163
164 return 0;
165 }
166
sport_stop(struct sport_device * sport)167 static int sport_stop(struct sport_device *sport)
168 {
169 sport->regs->tcr1 &= ~TSPEN;
170 sport->regs->rcr1 &= ~RSPEN;
171 SSYNC();
172
173 disable_dma(sport->dma_rx_chan);
174 disable_dma(sport->dma_tx_chan);
175 return 0;
176 }
177
sport_hook_rx_dummy(struct sport_device * sport)178 static inline int sport_hook_rx_dummy(struct sport_device *sport)
179 {
180 struct dmasg *desc, temp_desc;
181 unsigned long flags;
182
183 BUG_ON(sport->dummy_rx_desc == NULL);
184 BUG_ON(sport->curr_rx_desc == sport->dummy_rx_desc);
185
186 /* Maybe the dummy buffer descriptor ring is damaged */
187 sport->dummy_rx_desc->next_desc_addr = \
188 (unsigned long)(sport->dummy_rx_desc+1);
189
190 local_irq_save(flags);
191 desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_rx_chan);
192 /* Copy the descriptor which will be damaged to backup */
193 temp_desc = *desc;
194 desc->x_count = 0xa;
195 desc->y_count = 0;
196 desc->next_desc_addr = (unsigned long)(sport->dummy_rx_desc);
197 local_irq_restore(flags);
198 /* Waiting for dummy buffer descriptor is already hooked*/
199 while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
200 sizeof(struct dmasg)) !=
201 (unsigned long)sport->dummy_rx_desc)
202 ;
203 sport->curr_rx_desc = sport->dummy_rx_desc;
204 /* Restore the damaged descriptor */
205 *desc = temp_desc;
206
207 return 0;
208 }
209
sport_rx_dma_start(struct sport_device * sport,int dummy)210 static inline int sport_rx_dma_start(struct sport_device *sport, int dummy)
211 {
212 if (dummy) {
213 sport->dummy_rx_desc->next_desc_addr = \
214 (unsigned long) sport->dummy_rx_desc;
215 sport->curr_rx_desc = sport->dummy_rx_desc;
216 } else
217 sport->curr_rx_desc = sport->dma_rx_desc;
218
219 set_dma_next_desc_addr(sport->dma_rx_chan, \
220 (unsigned long)(sport->curr_rx_desc));
221 set_dma_x_count(sport->dma_rx_chan, 0);
222 set_dma_x_modify(sport->dma_rx_chan, 0);
223 set_dma_config(sport->dma_rx_chan, (DMAFLOW_LARGE | NDSIZE_9 | \
224 WDSIZE_32 | WNR));
225 set_dma_curr_addr(sport->dma_rx_chan, sport->curr_rx_desc->start_addr);
226 SSYNC();
227
228 return 0;
229 }
230
sport_tx_dma_start(struct sport_device * sport,int dummy)231 static inline int sport_tx_dma_start(struct sport_device *sport, int dummy)
232 {
233 if (dummy) {
234 sport->dummy_tx_desc->next_desc_addr = \
235 (unsigned long) sport->dummy_tx_desc;
236 sport->curr_tx_desc = sport->dummy_tx_desc;
237 } else
238 sport->curr_tx_desc = sport->dma_tx_desc;
239
240 set_dma_next_desc_addr(sport->dma_tx_chan, \
241 (unsigned long)(sport->curr_tx_desc));
242 set_dma_x_count(sport->dma_tx_chan, 0);
243 set_dma_x_modify(sport->dma_tx_chan, 0);
244 set_dma_config(sport->dma_tx_chan,
245 (DMAFLOW_LARGE | NDSIZE_9 | WDSIZE_32));
246 set_dma_curr_addr(sport->dma_tx_chan, sport->curr_tx_desc->start_addr);
247 SSYNC();
248
249 return 0;
250 }
251
sport_rx_start(struct sport_device * sport)252 int sport_rx_start(struct sport_device *sport)
253 {
254 unsigned long flags;
255 pr_debug("%s enter\n", __func__);
256 if (sport->rx_run)
257 return -EBUSY;
258 if (sport->tx_run) {
259 /* tx is running, rx is not running */
260 BUG_ON(sport->dma_rx_desc == NULL);
261 BUG_ON(sport->curr_rx_desc != sport->dummy_rx_desc);
262 local_irq_save(flags);
263 while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
264 sizeof(struct dmasg)) !=
265 (unsigned long)sport->dummy_rx_desc)
266 ;
267 sport->dummy_rx_desc->next_desc_addr =
268 (unsigned long)(sport->dma_rx_desc);
269 local_irq_restore(flags);
270 sport->curr_rx_desc = sport->dma_rx_desc;
271 } else {
272 sport_tx_dma_start(sport, 1);
273 sport_rx_dma_start(sport, 0);
274 sport_start(sport);
275 }
276
277 sport->rx_run = 1;
278
279 return 0;
280 }
281 EXPORT_SYMBOL(sport_rx_start);
282
sport_rx_stop(struct sport_device * sport)283 int sport_rx_stop(struct sport_device *sport)
284 {
285 pr_debug("%s enter\n", __func__);
286
287 if (!sport->rx_run)
288 return 0;
289 if (sport->tx_run) {
290 /* TX dma is still running, hook the dummy buffer */
291 sport_hook_rx_dummy(sport);
292 } else {
293 /* Both rx and tx dma will be stopped */
294 sport_stop(sport);
295 sport->curr_rx_desc = NULL;
296 sport->curr_tx_desc = NULL;
297 }
298
299 sport->rx_run = 0;
300
301 return 0;
302 }
303 EXPORT_SYMBOL(sport_rx_stop);
304
sport_hook_tx_dummy(struct sport_device * sport)305 static inline int sport_hook_tx_dummy(struct sport_device *sport)
306 {
307 struct dmasg *desc, temp_desc;
308 unsigned long flags;
309
310 BUG_ON(sport->dummy_tx_desc == NULL);
311 BUG_ON(sport->curr_tx_desc == sport->dummy_tx_desc);
312
313 sport->dummy_tx_desc->next_desc_addr = \
314 (unsigned long)(sport->dummy_tx_desc+1);
315
316 /* Shorten the time on last normal descriptor */
317 local_irq_save(flags);
318 desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_tx_chan);
319 /* Store the descriptor which will be damaged */
320 temp_desc = *desc;
321 desc->x_count = 0xa;
322 desc->y_count = 0;
323 desc->next_desc_addr = (unsigned long)(sport->dummy_tx_desc);
324 local_irq_restore(flags);
325 /* Waiting for dummy buffer descriptor is already hooked*/
326 while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) - \
327 sizeof(struct dmasg)) != \
328 (unsigned long)sport->dummy_tx_desc)
329 ;
330 sport->curr_tx_desc = sport->dummy_tx_desc;
331 /* Restore the damaged descriptor */
332 *desc = temp_desc;
333
334 return 0;
335 }
336
sport_tx_start(struct sport_device * sport)337 int sport_tx_start(struct sport_device *sport)
338 {
339 unsigned flags;
340 pr_debug("%s: tx_run:%d, rx_run:%d\n", __func__,
341 sport->tx_run, sport->rx_run);
342 if (sport->tx_run)
343 return -EBUSY;
344 if (sport->rx_run) {
345 BUG_ON(sport->dma_tx_desc == NULL);
346 BUG_ON(sport->curr_tx_desc != sport->dummy_tx_desc);
347 /* Hook the normal buffer descriptor */
348 local_irq_save(flags);
349 while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) -
350 sizeof(struct dmasg)) !=
351 (unsigned long)sport->dummy_tx_desc)
352 ;
353 sport->dummy_tx_desc->next_desc_addr =
354 (unsigned long)(sport->dma_tx_desc);
355 local_irq_restore(flags);
356 sport->curr_tx_desc = sport->dma_tx_desc;
357 } else {
358
359 sport_tx_dma_start(sport, 0);
360 /* Let rx dma run the dummy buffer */
361 sport_rx_dma_start(sport, 1);
362 sport_start(sport);
363 }
364 sport->tx_run = 1;
365 return 0;
366 }
367 EXPORT_SYMBOL(sport_tx_start);
368
sport_tx_stop(struct sport_device * sport)369 int sport_tx_stop(struct sport_device *sport)
370 {
371 if (!sport->tx_run)
372 return 0;
373 if (sport->rx_run) {
374 /* RX is still running, hook the dummy buffer */
375 sport_hook_tx_dummy(sport);
376 } else {
377 /* Both rx and tx dma stopped */
378 sport_stop(sport);
379 sport->curr_rx_desc = NULL;
380 sport->curr_tx_desc = NULL;
381 }
382
383 sport->tx_run = 0;
384
385 return 0;
386 }
387 EXPORT_SYMBOL(sport_tx_stop);
388
compute_wdsize(size_t wdsize)389 static inline int compute_wdsize(size_t wdsize)
390 {
391 switch (wdsize) {
392 case 1:
393 return WDSIZE_8;
394 case 2:
395 return WDSIZE_16;
396 case 4:
397 default:
398 return WDSIZE_32;
399 }
400 }
401
sport_config_rx_dma(struct sport_device * sport,void * buf,int fragcount,size_t fragsize)402 int sport_config_rx_dma(struct sport_device *sport, void *buf,
403 int fragcount, size_t fragsize)
404 {
405 unsigned int x_count;
406 unsigned int y_count;
407 unsigned int cfg;
408 dma_addr_t addr;
409
410 pr_debug("%s buf:%p, frag:%d, fragsize:0x%lx\n", __func__, \
411 buf, fragcount, fragsize);
412
413 x_count = fragsize / sport->wdsize;
414 y_count = 0;
415
416 /* for fragments larger than 64k words we use 2d dma,
417 * denote fragecount as two numbers' mutliply and both of them
418 * are less than 64k.*/
419 if (x_count >= 0x10000) {
420 int i, count = x_count;
421
422 for (i = 16; i > 0; i--) {
423 x_count = 1 << i;
424 if ((count & (x_count - 1)) == 0) {
425 y_count = count >> i;
426 if (y_count < 0x10000)
427 break;
428 }
429 }
430 if (i == 0)
431 return -EINVAL;
432 }
433 pr_debug("%s(x_count:0x%x, y_count:0x%x)\n", __func__,
434 x_count, y_count);
435
436 if (sport->dma_rx_desc)
437 dma_free_coherent(NULL, sport->rx_desc_bytes,
438 sport->dma_rx_desc, 0);
439
440 /* Allocate a new descritor ring as current one. */
441 sport->dma_rx_desc = dma_alloc_coherent(NULL, \
442 fragcount * sizeof(struct dmasg), &addr, 0);
443 sport->rx_desc_bytes = fragcount * sizeof(struct dmasg);
444
445 if (!sport->dma_rx_desc) {
446 pr_err("Failed to allocate memory for rx desc\n");
447 return -ENOMEM;
448 }
449
450 sport->rx_buf = buf;
451 sport->rx_fragsize = fragsize;
452 sport->rx_frags = fragcount;
453
454 cfg = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | WNR | \
455 (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
456
457 if (y_count != 0)
458 cfg |= DMA2D;
459
460 setup_desc(sport->dma_rx_desc, buf, fragcount, fragsize,
461 cfg|DMAEN, x_count, y_count, sport->wdsize);
462
463 return 0;
464 }
465 EXPORT_SYMBOL(sport_config_rx_dma);
466
sport_config_tx_dma(struct sport_device * sport,void * buf,int fragcount,size_t fragsize)467 int sport_config_tx_dma(struct sport_device *sport, void *buf, \
468 int fragcount, size_t fragsize)
469 {
470 unsigned int x_count;
471 unsigned int y_count;
472 unsigned int cfg;
473 dma_addr_t addr;
474
475 pr_debug("%s buf:%p, fragcount:%d, fragsize:0x%lx\n",
476 __func__, buf, fragcount, fragsize);
477
478 x_count = fragsize/sport->wdsize;
479 y_count = 0;
480
481 /* for fragments larger than 64k words we use 2d dma,
482 * denote fragecount as two numbers' mutliply and both of them
483 * are less than 64k.*/
484 if (x_count >= 0x10000) {
485 int i, count = x_count;
486
487 for (i = 16; i > 0; i--) {
488 x_count = 1 << i;
489 if ((count & (x_count - 1)) == 0) {
490 y_count = count >> i;
491 if (y_count < 0x10000)
492 break;
493 }
494 }
495 if (i == 0)
496 return -EINVAL;
497 }
498 pr_debug("%s x_count:0x%x, y_count:0x%x\n", __func__,
499 x_count, y_count);
500
501
502 if (sport->dma_tx_desc) {
503 dma_free_coherent(NULL, sport->tx_desc_bytes, \
504 sport->dma_tx_desc, 0);
505 }
506
507 sport->dma_tx_desc = dma_alloc_coherent(NULL, \
508 fragcount * sizeof(struct dmasg), &addr, 0);
509 sport->tx_desc_bytes = fragcount * sizeof(struct dmasg);
510 if (!sport->dma_tx_desc) {
511 pr_err("Failed to allocate memory for tx desc\n");
512 return -ENOMEM;
513 }
514
515 sport->tx_buf = buf;
516 sport->tx_fragsize = fragsize;
517 sport->tx_frags = fragcount;
518 cfg = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | \
519 (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
520
521 if (y_count != 0)
522 cfg |= DMA2D;
523
524 setup_desc(sport->dma_tx_desc, buf, fragcount, fragsize,
525 cfg|DMAEN, x_count, y_count, sport->wdsize);
526
527 return 0;
528 }
529 EXPORT_SYMBOL(sport_config_tx_dma);
530
531 /* setup dummy dma descriptor ring, which don't generate interrupts,
532 * the x_modify is set to 0 */
sport_config_rx_dummy(struct sport_device * sport)533 static int sport_config_rx_dummy(struct sport_device *sport)
534 {
535 struct dmasg *desc;
536 unsigned config;
537
538 pr_debug("%s entered\n", __func__);
539 #if L1_DATA_A_LENGTH != 0
540 desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
541 #else
542 {
543 dma_addr_t addr;
544 desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
545 }
546 #endif
547 if (desc == NULL) {
548 pr_err("Failed to allocate memory for dummy rx desc\n");
549 return -ENOMEM;
550 }
551 memset(desc, 0, 2 * sizeof(*desc));
552 sport->dummy_rx_desc = desc;
553 desc->start_addr = (unsigned long)sport->dummy_buf;
554 config = DMAFLOW_LARGE | NDSIZE_9 | compute_wdsize(sport->wdsize)
555 | WNR | DMAEN;
556 desc->cfg = config;
557 desc->x_count = sport->dummy_count/sport->wdsize;
558 desc->x_modify = sport->wdsize;
559 desc->y_count = 0;
560 desc->y_modify = 0;
561 memcpy(desc+1, desc, sizeof(*desc));
562 desc->next_desc_addr = (unsigned long)(desc+1);
563 desc[1].next_desc_addr = (unsigned long)desc;
564 return 0;
565 }
566
sport_config_tx_dummy(struct sport_device * sport)567 static int sport_config_tx_dummy(struct sport_device *sport)
568 {
569 struct dmasg *desc;
570 unsigned int config;
571
572 pr_debug("%s entered\n", __func__);
573
574 #if L1_DATA_A_LENGTH != 0
575 desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
576 #else
577 {
578 dma_addr_t addr;
579 desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
580 }
581 #endif
582 if (!desc) {
583 pr_err("Failed to allocate memory for dummy tx desc\n");
584 return -ENOMEM;
585 }
586 memset(desc, 0, 2 * sizeof(*desc));
587 sport->dummy_tx_desc = desc;
588 desc->start_addr = (unsigned long)sport->dummy_buf + \
589 sport->dummy_count;
590 config = DMAFLOW_LARGE | NDSIZE_9 |
591 compute_wdsize(sport->wdsize) | DMAEN;
592 desc->cfg = config;
593 desc->x_count = sport->dummy_count/sport->wdsize;
594 desc->x_modify = sport->wdsize;
595 desc->y_count = 0;
596 desc->y_modify = 0;
597 memcpy(desc+1, desc, sizeof(*desc));
598 desc->next_desc_addr = (unsigned long)(desc+1);
599 desc[1].next_desc_addr = (unsigned long)desc;
600 return 0;
601 }
602
sport_curr_offset_rx(struct sport_device * sport)603 unsigned long sport_curr_offset_rx(struct sport_device *sport)
604 {
605 unsigned long curr = get_dma_curr_addr(sport->dma_rx_chan);
606
607 return (unsigned char *)curr - sport->rx_buf;
608 }
609 EXPORT_SYMBOL(sport_curr_offset_rx);
610
sport_curr_offset_tx(struct sport_device * sport)611 unsigned long sport_curr_offset_tx(struct sport_device *sport)
612 {
613 unsigned long curr = get_dma_curr_addr(sport->dma_tx_chan);
614
615 return (unsigned char *)curr - sport->tx_buf;
616 }
617 EXPORT_SYMBOL(sport_curr_offset_tx);
618
sport_incfrag(struct sport_device * sport,int * frag,int tx)619 void sport_incfrag(struct sport_device *sport, int *frag, int tx)
620 {
621 ++(*frag);
622 if (tx == 1 && *frag == sport->tx_frags)
623 *frag = 0;
624
625 if (tx == 0 && *frag == sport->rx_frags)
626 *frag = 0;
627 }
628 EXPORT_SYMBOL(sport_incfrag);
629
sport_decfrag(struct sport_device * sport,int * frag,int tx)630 void sport_decfrag(struct sport_device *sport, int *frag, int tx)
631 {
632 --(*frag);
633 if (tx == 1 && *frag == 0)
634 *frag = sport->tx_frags;
635
636 if (tx == 0 && *frag == 0)
637 *frag = sport->rx_frags;
638 }
639 EXPORT_SYMBOL(sport_decfrag);
640
sport_check_status(struct sport_device * sport,unsigned int * sport_stat,unsigned int * rx_stat,unsigned int * tx_stat)641 static int sport_check_status(struct sport_device *sport,
642 unsigned int *sport_stat,
643 unsigned int *rx_stat,
644 unsigned int *tx_stat)
645 {
646 int status = 0;
647
648 if (sport_stat) {
649 SSYNC();
650 status = sport->regs->stat;
651 if (status & (TOVF|TUVF|ROVF|RUVF))
652 sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
653 SSYNC();
654 *sport_stat = status;
655 }
656
657 if (rx_stat) {
658 SSYNC();
659 status = get_dma_curr_irqstat(sport->dma_rx_chan);
660 if (status & (DMA_DONE|DMA_ERR))
661 clear_dma_irqstat(sport->dma_rx_chan);
662 SSYNC();
663 *rx_stat = status;
664 }
665
666 if (tx_stat) {
667 SSYNC();
668 status = get_dma_curr_irqstat(sport->dma_tx_chan);
669 if (status & (DMA_DONE|DMA_ERR))
670 clear_dma_irqstat(sport->dma_tx_chan);
671 SSYNC();
672 *tx_stat = status;
673 }
674
675 return 0;
676 }
677
sport_dump_stat(struct sport_device * sport,char * buf,size_t len)678 int sport_dump_stat(struct sport_device *sport, char *buf, size_t len)
679 {
680 int ret;
681
682 ret = snprintf(buf, len,
683 "sts: 0x%04x\n"
684 "rx dma %d sts: 0x%04x tx dma %d sts: 0x%04x\n",
685 sport->regs->stat,
686 sport->dma_rx_chan,
687 get_dma_curr_irqstat(sport->dma_rx_chan),
688 sport->dma_tx_chan,
689 get_dma_curr_irqstat(sport->dma_tx_chan));
690 buf += ret;
691 len -= ret;
692
693 ret += snprintf(buf, len,
694 "curr_rx_desc:0x%p, curr_tx_desc:0x%p\n"
695 "dma_rx_desc:0x%p, dma_tx_desc:0x%p\n"
696 "dummy_rx_desc:0x%p, dummy_tx_desc:0x%p\n",
697 sport->curr_rx_desc, sport->curr_tx_desc,
698 sport->dma_rx_desc, sport->dma_tx_desc,
699 sport->dummy_rx_desc, sport->dummy_tx_desc);
700
701 return ret;
702 }
703
rx_handler(int irq,void * dev_id)704 static irqreturn_t rx_handler(int irq, void *dev_id)
705 {
706 unsigned int rx_stat;
707 struct sport_device *sport = dev_id;
708
709 pr_debug("%s enter\n", __func__);
710 sport_check_status(sport, NULL, &rx_stat, NULL);
711 if (!(rx_stat & DMA_DONE))
712 pr_err("rx dma is already stopped\n");
713
714 if (sport->rx_callback) {
715 sport->rx_callback(sport->rx_data);
716 return IRQ_HANDLED;
717 }
718
719 return IRQ_NONE;
720 }
721
tx_handler(int irq,void * dev_id)722 static irqreturn_t tx_handler(int irq, void *dev_id)
723 {
724 unsigned int tx_stat;
725 struct sport_device *sport = dev_id;
726 pr_debug("%s enter\n", __func__);
727 sport_check_status(sport, NULL, NULL, &tx_stat);
728 if (!(tx_stat & DMA_DONE)) {
729 pr_err("tx dma is already stopped\n");
730 return IRQ_HANDLED;
731 }
732 if (sport->tx_callback) {
733 sport->tx_callback(sport->tx_data);
734 return IRQ_HANDLED;
735 }
736
737 return IRQ_NONE;
738 }
739
err_handler(int irq,void * dev_id)740 static irqreturn_t err_handler(int irq, void *dev_id)
741 {
742 unsigned int status = 0;
743 struct sport_device *sport = dev_id;
744
745 pr_debug("%s\n", __func__);
746 if (sport_check_status(sport, &status, NULL, NULL)) {
747 pr_err("error checking status ??");
748 return IRQ_NONE;
749 }
750
751 if (status & (TOVF|TUVF|ROVF|RUVF)) {
752 pr_info("sport status error:%s%s%s%s\n",
753 status & TOVF ? " TOVF" : "",
754 status & TUVF ? " TUVF" : "",
755 status & ROVF ? " ROVF" : "",
756 status & RUVF ? " RUVF" : "");
757 if (status & TOVF || status & TUVF) {
758 disable_dma(sport->dma_tx_chan);
759 if (sport->tx_run)
760 sport_tx_dma_start(sport, 0);
761 else
762 sport_tx_dma_start(sport, 1);
763 enable_dma(sport->dma_tx_chan);
764 } else {
765 disable_dma(sport->dma_rx_chan);
766 if (sport->rx_run)
767 sport_rx_dma_start(sport, 0);
768 else
769 sport_rx_dma_start(sport, 1);
770 enable_dma(sport->dma_rx_chan);
771 }
772 }
773 status = sport->regs->stat;
774 if (status & (TOVF|TUVF|ROVF|RUVF))
775 sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
776 SSYNC();
777
778 if (sport->err_callback)
779 sport->err_callback(sport->err_data);
780
781 return IRQ_HANDLED;
782 }
783
sport_set_rx_callback(struct sport_device * sport,void (* rx_callback)(void *),void * rx_data)784 int sport_set_rx_callback(struct sport_device *sport,
785 void (*rx_callback)(void *), void *rx_data)
786 {
787 BUG_ON(rx_callback == NULL);
788 sport->rx_callback = rx_callback;
789 sport->rx_data = rx_data;
790
791 return 0;
792 }
793 EXPORT_SYMBOL(sport_set_rx_callback);
794
sport_set_tx_callback(struct sport_device * sport,void (* tx_callback)(void *),void * tx_data)795 int sport_set_tx_callback(struct sport_device *sport,
796 void (*tx_callback)(void *), void *tx_data)
797 {
798 BUG_ON(tx_callback == NULL);
799 sport->tx_callback = tx_callback;
800 sport->tx_data = tx_data;
801
802 return 0;
803 }
804 EXPORT_SYMBOL(sport_set_tx_callback);
805
sport_set_err_callback(struct sport_device * sport,void (* err_callback)(void *),void * err_data)806 int sport_set_err_callback(struct sport_device *sport,
807 void (*err_callback)(void *), void *err_data)
808 {
809 BUG_ON(err_callback == NULL);
810 sport->err_callback = err_callback;
811 sport->err_data = err_data;
812
813 return 0;
814 }
815 EXPORT_SYMBOL(sport_set_err_callback);
816
sport_init(struct sport_param * param,unsigned wdsize,unsigned dummy_count,void * private_data)817 struct sport_device *sport_init(struct sport_param *param, unsigned wdsize,
818 unsigned dummy_count, void *private_data)
819 {
820 int ret;
821 struct sport_device *sport;
822 pr_debug("%s enter\n", __func__);
823 BUG_ON(param == NULL);
824 BUG_ON(wdsize == 0 || dummy_count == 0);
825 sport = kmalloc(sizeof(struct sport_device), GFP_KERNEL);
826 if (!sport) {
827 pr_err("Failed to allocate for sport device\n");
828 return NULL;
829 }
830
831 memset(sport, 0, sizeof(struct sport_device));
832 sport->dma_rx_chan = param->dma_rx_chan;
833 sport->dma_tx_chan = param->dma_tx_chan;
834 sport->err_irq = param->err_irq;
835 sport->regs = param->regs;
836 sport->private_data = private_data;
837
838 if (request_dma(sport->dma_rx_chan, "SPORT RX Data") == -EBUSY) {
839 pr_err("Failed to request RX dma %d\n", \
840 sport->dma_rx_chan);
841 goto __init_err1;
842 }
843 if (set_dma_callback(sport->dma_rx_chan, rx_handler, sport) != 0) {
844 pr_err("Failed to request RX irq %d\n", \
845 sport->dma_rx_chan);
846 goto __init_err2;
847 }
848
849 if (request_dma(sport->dma_tx_chan, "SPORT TX Data") == -EBUSY) {
850 pr_err("Failed to request TX dma %d\n", \
851 sport->dma_tx_chan);
852 goto __init_err2;
853 }
854
855 if (set_dma_callback(sport->dma_tx_chan, tx_handler, sport) != 0) {
856 pr_err("Failed to request TX irq %d\n", \
857 sport->dma_tx_chan);
858 goto __init_err3;
859 }
860
861 if (request_irq(sport->err_irq, err_handler, IRQF_SHARED, "SPORT err",
862 sport) < 0) {
863 pr_err("Failed to request err irq:%d\n", \
864 sport->err_irq);
865 goto __init_err3;
866 }
867
868 pr_err("dma rx:%d tx:%d, err irq:%d, regs:%p\n",
869 sport->dma_rx_chan, sport->dma_tx_chan,
870 sport->err_irq, sport->regs);
871
872 sport->wdsize = wdsize;
873 sport->dummy_count = dummy_count;
874
875 #if L1_DATA_A_LENGTH != 0
876 sport->dummy_buf = l1_data_sram_alloc(dummy_count * 2);
877 #else
878 sport->dummy_buf = kmalloc(dummy_count * 2, GFP_KERNEL);
879 #endif
880 if (sport->dummy_buf == NULL) {
881 pr_err("Failed to allocate dummy buffer\n");
882 goto __error;
883 }
884
885 memset(sport->dummy_buf, 0, dummy_count * 2);
886 ret = sport_config_rx_dummy(sport);
887 if (ret) {
888 pr_err("Failed to config rx dummy ring\n");
889 goto __error;
890 }
891 ret = sport_config_tx_dummy(sport);
892 if (ret) {
893 pr_err("Failed to config tx dummy ring\n");
894 goto __error;
895 }
896
897 return sport;
898 __error:
899 free_irq(sport->err_irq, sport);
900 __init_err3:
901 free_dma(sport->dma_tx_chan);
902 __init_err2:
903 free_dma(sport->dma_rx_chan);
904 __init_err1:
905 kfree(sport);
906 return NULL;
907 }
908 EXPORT_SYMBOL(sport_init);
909
sport_done(struct sport_device * sport)910 void sport_done(struct sport_device *sport)
911 {
912 if (sport == NULL)
913 return;
914
915 sport_stop(sport);
916 if (sport->dma_rx_desc)
917 dma_free_coherent(NULL, sport->rx_desc_bytes,
918 sport->dma_rx_desc, 0);
919 if (sport->dma_tx_desc)
920 dma_free_coherent(NULL, sport->tx_desc_bytes,
921 sport->dma_tx_desc, 0);
922
923 #if L1_DATA_A_LENGTH != 0
924 l1_data_sram_free(sport->dummy_rx_desc);
925 l1_data_sram_free(sport->dummy_tx_desc);
926 l1_data_sram_free(sport->dummy_buf);
927 #else
928 dma_free_coherent(NULL, 2*sizeof(struct dmasg),
929 sport->dummy_rx_desc, 0);
930 dma_free_coherent(NULL, 2*sizeof(struct dmasg),
931 sport->dummy_tx_desc, 0);
932 kfree(sport->dummy_buf);
933 #endif
934 free_dma(sport->dma_rx_chan);
935 free_dma(sport->dma_tx_chan);
936 free_irq(sport->err_irq, sport);
937
938 kfree(sport);
939 sport = NULL;
940 }
941 EXPORT_SYMBOL(sport_done);
942 /*
943 * It is only used to send several bytes when dma is not enabled
944 * sport controller is configured but not enabled.
945 * Multichannel cannot works with pio mode */
946 /* Used by ac97 to write and read codec register */
sport_send_and_recv(struct sport_device * sport,u8 * out_data,u8 * in_data,int len)947 int sport_send_and_recv(struct sport_device *sport, u8 *out_data, \
948 u8 *in_data, int len)
949 {
950 unsigned short dma_config;
951 unsigned short status;
952 unsigned long flags;
953 unsigned long wait = 0;
954
955 pr_debug("%s enter, out_data:%p, in_data:%p len:%d\n", \
956 __func__, out_data, in_data, len);
957 pr_debug("tcr1:0x%04x, tcr2:0x%04x, tclkdiv:0x%04x, tfsdiv:0x%04x\n"
958 "mcmc1:0x%04x, mcmc2:0x%04x\n",
959 sport->regs->tcr1, sport->regs->tcr2,
960 sport->regs->tclkdiv, sport->regs->tfsdiv,
961 sport->regs->mcmc1, sport->regs->mcmc2);
962 flush_dcache_range((unsigned)out_data, (unsigned)(out_data + len));
963
964 /* Enable tx dma */
965 dma_config = (RESTART | WDSIZE_16 | DI_EN);
966 set_dma_start_addr(sport->dma_tx_chan, (unsigned long)out_data);
967 set_dma_x_count(sport->dma_tx_chan, len/2);
968 set_dma_x_modify(sport->dma_tx_chan, 2);
969 set_dma_config(sport->dma_tx_chan, dma_config);
970 enable_dma(sport->dma_tx_chan);
971
972 if (in_data != NULL) {
973 invalidate_dcache_range((unsigned)in_data, \
974 (unsigned)(in_data + len));
975 /* Enable rx dma */
976 dma_config = (RESTART | WDSIZE_16 | WNR | DI_EN);
977 set_dma_start_addr(sport->dma_rx_chan, (unsigned long)in_data);
978 set_dma_x_count(sport->dma_rx_chan, len/2);
979 set_dma_x_modify(sport->dma_rx_chan, 2);
980 set_dma_config(sport->dma_rx_chan, dma_config);
981 enable_dma(sport->dma_rx_chan);
982 }
983
984 local_irq_save(flags);
985 sport->regs->tcr1 |= TSPEN;
986 sport->regs->rcr1 |= RSPEN;
987 SSYNC();
988
989 status = get_dma_curr_irqstat(sport->dma_tx_chan);
990 while (status & DMA_RUN) {
991 udelay(1);
992 status = get_dma_curr_irqstat(sport->dma_tx_chan);
993 pr_debug("DMA status:0x%04x\n", status);
994 if (wait++ > 100)
995 goto __over;
996 }
997 status = sport->regs->stat;
998 wait = 0;
999
1000 while (!(status & TXHRE)) {
1001 pr_debug("sport status:0x%04x\n", status);
1002 udelay(1);
1003 status = *(unsigned short *)&sport->regs->stat;
1004 if (wait++ > 1000)
1005 goto __over;
1006 }
1007 /* Wait for the last byte sent out */
1008 udelay(20);
1009 pr_debug("sport status:0x%04x\n", status);
1010
1011 __over:
1012 sport->regs->tcr1 &= ~TSPEN;
1013 sport->regs->rcr1 &= ~RSPEN;
1014 SSYNC();
1015 disable_dma(sport->dma_tx_chan);
1016 /* Clear the status */
1017 clear_dma_irqstat(sport->dma_tx_chan);
1018 if (in_data != NULL) {
1019 disable_dma(sport->dma_rx_chan);
1020 clear_dma_irqstat(sport->dma_rx_chan);
1021 }
1022 SSYNC();
1023 local_irq_restore(flags);
1024
1025 return 0;
1026 }
1027 EXPORT_SYMBOL(sport_send_and_recv);
1028
1029 MODULE_AUTHOR("Roy Huang");
1030 MODULE_DESCRIPTION("SPORT driver for ADI Blackfin");
1031 MODULE_LICENSE("GPL");
1032
1033